High-temperature and high-pressure labyrinth sleeve balance adjusting stop valve

Abstract

A high-temperature and high-pressure labyrinth sleeve balance adjusting stop valve relates to the technical field of valves and comprises a valve body, a valve core and a valve seat, the valve seat is arranged at the central position of a flow channel in the valve body, the valve core is arranged above the valve seat, a valve cage and a labyrinth sleeve are arranged around the valve core, and the labyrinth sleeve is arranged between the valve cage and the valve seat. The labyrinth sleeve comprises a sleeve upper cover and a sleeve bottom cover, a plurality of labyrinth discs are arranged between the sleeve upper cover and the sleeve bottom cover, the labyrinth discs are distributed on the outer side of the valve element in a circular ring shape, and each labyrinth disc is provided with a plurality of zigzag protrusions from inside to outside. And the sleeve upper cover and the uppermost labyrinth disc, the sleeve bottom cover and the lowermost labyrinth disc, and every two adjacent labyrinth discs form a zigzag labyrinth channel. Through the design of the unitized corrugated labyrinth disc, the labyrinth sleeve structure is achieved through a simpler process, the labyrinth channels are vertically distributed, and compared with a traditional labyrinth sleeve, the labyrinth sleeve has the better flow guiding and pressure dividing effect under the high-temperature and high-pressure environment.

Description

Technical Field

[0001] The invention relates to the technical field of valves, and in particular to a high-temperature and high-pressure labyrinth sleeve balanced regulating stop valve. Background Art

[0002] A regulating valve is a valve used to adjust process parameters such as medium flow, pressure, temperature, liquid level, etc. in the field of industrial automation process control. It automatically adjusts the valve opening according to the control signal in the automation system, thereby achieving the regulation of medium flow, pressure, temperature and liquid level.

[0003] At present, high-pressure regulating valves are classified according to the form of valve internal parts: multi-stage high-pressure regulating valves, labyrinth high-pressure regulating valves and single-seat sleeve load-type high-pressure regulating valves, etc. Among them, the labyrinth high-pressure regulating valve is used to divert the fluid by setting a number of labyrinth flow channels on the labyrinth sleeve, while the adjacent labyrinth discs of the ordinary labyrinth regulating valve are fixedly installed, resulting in the same spacing between the labyrinth flow channels. Therefore, for media with different flow and pressure sizes, its pressure relief and rectification capacity remains unchanged and cannot be adaptively adjusted. For flow regulating valves using high-pressure fluids, the workload of the moving parts inside the valve body will be increased. In addition, traditional labyrinth sleeves usually use multi-layer staggered, spiral or radially distributed flow channels, which need to be formed by precision casting, multi-axis CNC machining or EDM machining, and the process is complicated and costly. When processing this labyrinth flow channel as a whole, a large amount of material needs to be removed from the solid billet, which is time-consuming and wasteful. Summary of the invention

[0004] The present invention adopts modular wavy labyrinth discs to form a labyrinth channel sleeve for fixed assembly, and uses positioning pins for flexible fixation, thereby solving the problems of insufficient ability of traditional labyrinth regulating valves to cope with high-pressure fluids and complex processing.

[0005] The technical solution adopted by the present invention is: A valve cover is provided at the opening above the valve body, and the valve cover is fixedly connected to the valve body. A valve seat is provided at the center of the internal flow channel of the valve body, and a valve core is provided above the valve seat. A valve cage and a labyrinth sleeve are provided around the valve core, and the labyrinth sleeve is arranged between the valve cage and the valve seat. The labyrinth sleeve comprises a sleeve upper cover and a sleeve bottom cover, and a plurality of labyrinth discs are arranged between the sleeve upper cover and the sleeve bottom cover. The labyrinth discs are distributed on the outer side of the valve core in a circular shape, and each labyrinth disc is provided with a plurality of wavy protrusions from the inside to the outside. The sleeve upper cover and the uppermost labyrinth disc, the sleeve bottom cover and the lowermost labyrinth disc, and every two adjacent labyrinth discs form a wavy labyrinth channel, and the sleeve upper cover, the sleeve bottom cover and the labyrinth disc are fixedly connected by locating pins.

[0006] A valve stem is arranged above the valve core, and the valve stem extends upward to the top of the valve cover. A hand wheel is arranged at the top of the valve stem, and the hand wheel is used to drive the valve stem to move in the vertical direction.

[0007] A positioning plate is provided below the valve cover, and the positioning plate is tightly arranged between the valve cover and the valve body through a sealing gasket.

[0008] An inner pressure sleeve is arranged between the positioning disc and the valve seat, and an outer pressure sleeve is arranged between the positioning disc and the labyrinth sleeve.

[0009] A metal piston sealing ring is arranged between the inner pressure sleeve and the valve seat.

[0010] An opening indication assembly is arranged above the valve stem, and the opening indication assembly comprises an opening indication sleeve, an opening indicator and an indication sheet. The opening indicator is arranged inside the opening indication sleeve, and the indication sheet is connected to the top end of the valve stem.

[0011] The valve core is provided with a pressure balancing hole. The middle section of the valve cover is provided with a graphite pressing sleeve and a packing pressing plate, the graphite pressing sleeve is arranged at the lower end of the packing pressing plate, the packing pressing plate is connected to the valve cover through a movable bolt nut and a split pin shaft, and the valve stem is arranged in the middle section of the valve cover and fits tightly with the graphite pressing sleeve.

[0012] The valve cover is provided with a guide block, and the guide block is used to fix the moving direction of the valve stem.

[0013] The beneficial effects of the present invention are as follows: the present invention realizes the labyrinth sleeve structure with a simpler process through the design of unitized wavy labyrinth discs and positioning pins. At the same time, in the labyrinth sleeve structure adopted by the present invention, the labyrinth channels are distributed in the vertical direction, which has a better flow diversion and pressure division effect under high temperature and high pressure environment than the traditional labyrinth sleeve. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a structural schematic diagram of the present invention.

[0015] Figure 2 It is a schematic diagram of the specific structure of the maze disc part of the present invention.

[0016] Figure 3 It is a structural diagram of the opening indicator part.

[0017] Figure 4 It is a structural schematic diagram of the metal piston sealing structure.

[0018] Figure 5 It is a structural schematic diagram of the pressure balance hole.

[0019] In the figure: 1. valve body; 2. labyrinth disc; 3. locating pin; 4. valve seat; 5. valve core; 501. pressure balance hole; 6. valve cage; 7. metal piston sealing ring; 8. valve disc gland; 9. inner pressure sleeve; 10. outer pressure sleeve; 11. locating plate; 12. sealing gasket; 13. fixing bolts and nuts; 14. valve cover; 15. valve stem; 16. graphite pressure sleeve; 17. packing pressure plate; 18. bracket; 19. valve stem nut; 20. valve stem nut gland; 21. hand wheel; 22. opening indicator sleeve; 23. opening indicator; 24. indicator plate; 25. movable bolt and nut; 26. cotter pin; 27. guide block; 28. sleeve upper cover; 29. ​​sleeve bottom cover. DETAILED DESCRIPTION

[0020] The present invention is described in detail below with reference to the accompanying drawings.

[0021] like Figure 1 A high-temperature and high-pressure labyrinth sleeve balanced regulating stop valve comprises a valve body 1, a valve seat 4, a valve core 5, a valve cover 14 and a valve stem 15. The valve seat 4 is installed at the middle section of the central flow channel of the stop valve body 1, and the valve core 5 is arranged above the valve seat 4. The valve core 5 is tightly connected to the valve stem 15 through the valve disc gland 8. The upper end of the valve stem 15 is connected with a hand wheel 21. A valve stem nut 19 and a valve stem nut gland 20 are arranged below the hand wheel 21 to fix the valve stem 15 and the hand wheel 21 to the top of the valve stem 15. The valve cover 14 is fixed at the upper opening of the valve body 1 by fixing bolts and nuts 13. A bracket 18 is arranged on the valve cover 14, and the bracket 18 plays a supporting role for the valve cover 14 and the valve stem 15 structure.

[0022] A valve cage 6 is arranged around the valve core 5, and the valve cage 6 is used to guide the flow direction of the fluid medium at the junction of the flow channel of the valve body 1 and the valve core 5. In a high temperature and high pressure environment, only the valve cage 6 is arranged to have a limited guiding effect on the fluid medium. Therefore, the present invention also sets a labyrinth sleeve around the valve core 5, and the labyrinth sleeve is arranged between the valve cage 6 and the valve seat 4. The labyrinth sleeve is composed of a number of labyrinth discs 2 with the same structure, a sleeve upper cover 28 arranged on the top labyrinth disc 2, a sleeve bottom cover 29 arranged under the bottom labyrinth disc 2, and a number of positioning pins 3. The setting of the labyrinth sleeve can divert the fluid and then reduce its pressure in a high temperature and high pressure environment, thereby achieving the effect of guiding the flow direction of the fluid medium.

[0023] like Figure 2Compared with the sleeve composed of traditional labyrinth discs, the present invention has made improvements in structure and process. Traditional labyrinth discs are all milled out with labyrinth channels on the disc body, and then the labyrinth discs are stacked and combined into a labyrinth disc sleeve. In the present invention, the labyrinth disc 2 adopts a wavy design, and the labyrinth disc 2 body is annular, and from its inner side to the outermost side, it is respectively provided with a number of wavy protrusions distributed in annular shapes, and the distribution spacing of each wavy protrusion is the same. Each labyrinth disc 2 has the same shape, and every two adjacent labyrinth discs 2 are fixedly connected by locating pins 3, and at the same time, the gap between every two adjacent labyrinth discs 2 in the vertical direction constitutes a labyrinth channel. At the same time, the sleeve upper cover 28 is also fixedly connected to the uppermost labyrinth disc 2 by the locating pins 3, and the sleeve bottom cover 29 is fixedly connected to the lowermost labyrinth disc 2 by the locating pins 3, and a labyrinth channel is also formed in the vertical direction accordingly. In the vertical direction, the positioning pins 3 are arranged on the vertical line so that each labyrinth disc 2 can be aligned, ensuring that the labyrinth channels formed after stacking are of the same size and shape, so that the labyrinth channels can accurately dock with the fluid medium. Compared with the traditional labyrinth channels milled on the disc, this labyrinth channel has a larger vertical space, can gradually reduce the pressure of the high-pressure medium, reduce the erosion of the sealing surface by the high-speed fluid, reduce vibration and noise, and is more suitable for high-pressure difference conditions than the traditional labyrinth channel.

[0024] The labyrinth sleeve used in the present invention adopts a modular design. When a labyrinth disc 2 or a positioning pin 3 is worn or even damaged, since the labyrinth discs 2 and the positioning pins 3 have the same structure, the overall structure of the labyrinth sleeve can be restored by simply replacing the damaged parts. At the same time, the labyrinth disc 2 used in the present invention has a simpler structure, and its wavy structure requires a simpler processing technology than the traditional hollow milling structure, and only an ordinary lathe is required to complete the processing. Traditional labyrinth discs require three-dimensional engraving and other technologies to complete.

[0025] In the present invention, a plurality of compression sleeves are further provided between the valve core 5, the valve body 1 and the valve cover 14. The compression sleeves fill the gaps between the valve cover 14 and the valve core 5 and the valve body 1, and improve the air tightness of the valve body 1 and the valve core 5 structure while maintaining the overall strength. A positioning plate 11 is provided at the connection between the valve cover 14 and the inside of the valve body 1, and sealing gaskets 12 are provided on both sides of the positioning plate 11. An inner compression sleeve 9 and an outer compression sleeve 10 are provided between the bottom surface of the positioning plate 11 and the valve core 5. The inner compression sleeve 9 is arranged between the valve cage 6 and the positioning plate 11, and the outer compression sleeve 10 is arranged between the labyrinth sleeve and the positioning plate 11. By providing the compression sleeve and the positioning plate 11, the positions of the valve cage 6 and the labyrinth sleeve are also kept fixed, thereby ensuring the structural integrity of the stop valve when it is working.

[0026] In order to cope with high temperature and high pressure environment, a metal piston seal ring 7 is provided between the gap between the valve cage 6 and the inner pressure sleeve 9. Figure 4There is a square gap between the cage 6 and the inner pressure sleeve 9, and a metal piston seal ring 7 is provided in the gap to fit the gap. Compared with seal rings of other materials, the metal piston seal ring 7 has the advantage of being able to achieve reliable sealing by utilizing the rigidity and durability of metal materials in extreme environments such as high temperature, high pressure, and strong corrosion. In the present invention, when in use, the medium pressure of high temperature and high pressure pushes the metal piston seal ring 7 to deform so that it fits tightly with the gap, thereby enhancing the sealing performance of the stop valve.

[0027] In order to enable the valve stem 15 to move better between the valve cover 14 and the valve body 1, a graphite compression sleeve 16 and a packing pressure plate 17 are provided in the middle section of the valve cover 14. The packing pressure plate 17 is fixed to the valve cover 14 by a movable bolt nut 25 and a split pin 26, and the graphite compression sleeve 16 is provided on the inner side of the packing pressure plate 17. The valve stem 15 is in direct contact with the graphite compression sleeve 16 in the middle section of the valve cover 14, so that the movement of the valve stem 15 in the middle section of the valve cover 14 is smoother. A guide block 27 is also provided above the middle section of the valve cover 14, and the guide block 27 is used to guide the valve stem 15 to move in the vertical direction to prevent its moving direction from being offset. At the same time, a pressure balance hole 501 is provided at the valve core 5. The pressure balance hole 501 uses the pressure of the fluid medium flowing through the valve core 5 to offset the axial force on the valve core 5 when it is driven by the valve stem 15 to move upward, thereby reducing the operating torque of the valve opening and closing, making it easier to open and close the valve under high pressure environment.

[0028] In order to better indicate the valve opening with intuitive and quantitative data, the present invention is provided with an opening indicator assembly. The opening indicator assembly includes an opening indicator sleeve 22, an opening indicator 23 and an indicator sheet 24. The indicator sheet 24 is connected to the valve stem 15, and the opening indicator 23 is fixedly arranged on the inner side of the opening indicator sleeve 22. When the user turns the hand wheel 21 to adjust the valve opening, the corresponding valve stem 15 moves in the vertical direction, and the indicator sheet 24 also moves accordingly. After the user stops turning the hand wheel 21, the indicator sheet 24 also stays on a certain scale on the opening indicator 23 with the valve stem 15, thereby indicating the opening position of the valve core 5 at this time. Displaying the opening position of the valve core 5 through this structure is conducive to the user to accurately adjust the flow or pressure.

[0029] The above content describes the specific features and implementation scheme of the present invention. It should be noted that the specific implementation of the present invention is not limited to the above-mentioned methods. As long as various non-substantial improvements are made using the technical solution of the present invention, or the concept and technical solution of the present invention are directly applied to other occasions without improvement, they are all within the scope of protection of the invention. The scope of protection required by the present invention is defined by the claims and their equivalents.

Claims

1. A high-temperature and high-pressure labyrinth sleeve balanced regulating stop valve, comprising a valve body, a valve cover, a valve core, and a valve seat, characterized in that: A valve cover (14) is provided at the opening above the valve body (1), and the valve cover (14) is fixedly connected to the valve body (1). A valve seat (4) is provided at the center of the flow channel inside the valve body (1), and a valve core (5) is provided above the valve seat (4). A valve cage (6) and a labyrinth sleeve are provided around the valve core (5), and the labyrinth sleeve is provided between the valve cage (6) and the valve seat (4). The labyrinth sleeve comprises a sleeve upper cover (28) and a sleeve bottom cover (29), and a plurality of sleeves are provided between the sleeve upper cover (28) and the sleeve bottom cover (29). A dry labyrinth disc (2), wherein the labyrinth disc (2) is distributed in a circular ring shape on the outer side of the valve core (5), and each labyrinth disc (2) is provided with a plurality of wavy protrusions from the inside to the outside. A wavy labyrinth channel is formed between the sleeve upper cover (28) and the uppermost labyrinth disc (2), the sleeve bottom cover (29) and the lowermost labyrinth disc (2), and between every two adjacent labyrinth discs (2), and the sleeve upper cover (28), the sleeve bottom cover (29) and the labyrinth disc (2) are fixedly connected by positioning pins (3).

2. A high temperature and high pressure labyrinth sleeve balanced regulating stop valve according to claim 1, characterized in that: A valve stem (15) is provided above the valve core (5), the valve stem (15) extending upward to the top end of the valve cover (14), and a hand wheel (21) is provided at the top end of the valve stem (15), the hand wheel (21) being used to drive the valve stem (15) to move in a vertical direction.

3. A high temperature and high pressure labyrinth sleeve balanced regulating stop valve according to claim 1, characterized in that: A positioning plate (11) is provided below the valve cover (14), and the positioning plate (11) is tightly arranged between the valve cover (14) and the valve body (1) via a sealing gasket (12).

4. A high temperature and high pressure labyrinth sleeve balanced regulating stop valve according to claim 3, characterized in that: An inner pressure sleeve (9) is provided between the positioning disc (11) and the valve seat (4), and an outer pressure sleeve (10) is provided between the positioning disc (11) and the labyrinth sleeve.

5. A high temperature and high pressure labyrinth sleeve balanced regulating stop valve according to claim 4, characterized in that: A metal piston sealing ring (7) is provided between the inner pressure sleeve (9) and the valve seat (4).

6. A high temperature and high pressure labyrinth sleeve balanced regulating stop valve according to claim 2, characterized in that: An opening indication assembly is provided above the valve stem (15), the opening indication assembly comprising an opening indication sleeve (22), an opening indicator (23) and an indication sheet (24), the opening indicator (23) being arranged inside the opening indication sleeve (22), and the indication sheet (24) being connected to the top end of the valve stem (15).

7. The high-temperature and high-pressure labyrinth sleeve balanced regulating stop valve according to claim 1, characterized in that: The valve core (5) is provided with a pressure balancing hole (501).

8. The high-temperature and high-pressure labyrinth sleeve balanced regulating stop valve according to claim 2, characterized in that: The middle section of the valve cover (14) is provided with a graphite pressing sleeve (16) and a packing pressing plate (17); the graphite pressing sleeve (16) is arranged at the lower end of the packing pressing plate (17); the packing pressing plate (17) is connected to the valve cover (14) through a movable bolt nut (25) and a split pin (26); the valve stem (15) is arranged in the middle section of the valve cover (14) and is tightly fitted with the graphite pressing sleeve (16).

9. The high-temperature and high-pressure labyrinth sleeve balanced regulating stop valve according to claim 2, characterized in that: The valve cover (14) is provided with a guide block (27), and the guide block (27) is used to fix the moving direction of the valve stem (15).

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